Pipe rib gasket



FIG. 1 is a perspective view of a pipe rib gasket showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof; and,

FIG. 5 is a cross-sectional view thereof taken along line 5-5 of FIG. 1.

The broken lines shown in FIGS. 1 and 5 represent environmental structure and form no part of the claimed design. 

I claim the ornamental design for a pipe rib gasket, as shown and described. 